1. class JoScott extends toxi.sim.grayscott.GrayScott {
   int xf = width/2;
   int yf = height/2;
   //int f= xcoord;
2.   JoScott(int width, int height, boolean wrap) {
     super(width, height, wrap);
    
     float xfcof getFCoeffAt( xf,  yf) {
          return f*xf;
    }
3.   float getFOverride(int xf, int yf){
      return this.getFCoeffAt(x,y);
     
      }
     }
   }